QUESTION 9 Which statements are written in past passive tense? (Check all that a

Question

QUESTION 9 Which statements are written in past passive tense? (Check all that apply.) a. Samples were filtered in triplicate using polycarbonate filters. b. The student synthesized aspirin. C. We mixed the two reagents before heating the mixture to boiling. Dye samples were diluted by a factor of five. e. Transfer the first solution into an Erlenmeyer flask. QUESTION 10 Which of the following is a scientific purpose? (Check all that apply.) a. The purpose of the experiment was to identify heat of reaction for the combustion of ethanol D. The purpose of the experiment was to determine the concentration of an unknown acid solution through titration. C. The purpose of the experiment was to measure the rate of the iodine-clock reaction and calculate the reaction order d. The purpose of the experiment was to practice titration technique. e. The purpose of the experiment was to become more familiar with scientific glassware.

Explanation / Answer

Question 9. in past passive, was or were are used along with the 3rd form of a verb.
so the answer will be (a,d), both are written in past passive form.

Question. 10 Scientific purpose is related to measurement or study of some activity taking place in nature or in the surrounding. It should be logical and justifiable.
So the answer will be (B and C) in these two statements, there is some parameter being measured or determined.
options C, D talks about being familiar or practice which is not a scientific purpose, option A is also not a scientific purpose because it is only identifying.

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